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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-7 = x-(3/x)+11 // - x-(3/x)+11
3/x-x-11-7 = 0
3*x^-1-1*x^1-18*x^0 = 0
(3*x^0-1*x^2-18*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-1*x^2-18*x^1) = 0
x^1
3-x^2-18*x = 0
3-x^2-18*x = 0
DELTA = (-18)^2-(-1*3*4)
DELTA = 336
DELTA > 0
x = (336^(1/2)+18)/(-1*2) or x = (18-336^(1/2))/(-1*2)
x = (4*21^(1/2)+18)/(-2) or x = (18-4*21^(1/2))/(-2)
x in { (4*21^(1/2)+18)/(-2), (18-4*21^(1/2))/(-2)}
x in { (4*21^(1/2)+18)/(-2), (18-4*21^(1/2))/(-2) }
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